Ftm tubs with really sensitive bottom growth having to sit on an older mans lap for a short car ride (doesn’t matter who, just emphasis on how much older and bigger they are than him). He gets all flustered and tries to get himself off without anyone noticing, and since he’s naturally so squirmy and cuddly, it almost works. But of course the older notices, and when they get to where they’re going he pulls the boy aside and fucks him (bonus points if they call him babyboy and/or darling)
All of this is so good. But anon, may I raise you. The person fingering him in the car or making him get off on their lap, telling him he has to be quiet or else they're going to get caught. Maybe they're touching him through his clothes or maybe they have their hands in his pants to touch him. But either way, they're focused on his little cock, knowing it's going to rile him up even more. They live for how much he's squirming and fighting back noises.